Method and machine for making paper.



C. ELPOPE. METHOD AND MACHINE FOR MAKING PAPER.

APPLICATION FILED FEB- 19,1914.

Patented May 25, 1915.

Wineses:

. methods.

CHARLES E. POPE,

OF HOLYOKE, MASSACHUSETTS.

METHOD AND MACHINE FOR MAKING PAPER.

Specification of Letters Patent.

Patented May 25, 1915.

Application filed February 19, 1914. I Serial No. 819,826.

To all whom it may concern Be it known that I, CHARLES E. Porn, acitizen of the United States, residing at Holyoke, in the county ofHampden and State of Massachusetts, have invented an Improvement inMethods and Machines for Making Paper, of which the following is aspecification.

In paper-making machines, the felt passes between the first one or moresets of pressrolls and the web is carried between the press-rolls withand by the felt, and the tendency is for the web, when leaving the biteof said rolls, to follow the cylindrical surface of the upperpress-roll, thus being removed from the felt, and winding upon saidpress-roll. In starting the machine after a break has occurred or afterit has been stopped for any other reason, the web always or almostalways sticks to the upper pressroll and follows it around to the usualdoctor by which it is scraped from the roll and on which it masses in ahugh pile of waste until a highly skilled operative is able to removethe web by hand from the pressroll and stick it to the felt so that it'will move with it. .When this has been done successfully the pull ofthe web will ordinarily be suflicient to overcome the tendency for theweb to stick toand wind upon the press-roll and thereby cause the web tofollow the felt, so as to be moved with and by it. \Vhatever efforts mayhave been made to cause the web to leave the roll by other than manualmeans have not been sulficiently successful to displace manual Thedifiiculty is increased in proportion to the speed of the machine. Atthe present time. machines are often run at a very highspeed and efiortsare being made constantly to increase the speed, with the result thatthe taking off of the web from the press-roll and carrying it to thefelt, by a. manual operation, notwithstanding the skill of the highlytrained operator, is a serious problem. A machine cannot be run fasterthan it is possible to do this work.

This invention involves a novel method of taking olf the web from thepress-roll and carrying it to the felt; and also involves means forcarrying out said method, which means is associated with the upperpress-roll and is arranged adjacent the felt by which the web is takenoff of said roll and carried drical surface thereof, so that to thefelt, and the well-known manual operation thereby dispensed with.

In the embodiment of my invention shown. for illustration, means areprovided for forcibly delivering a thin sheet of air substantiallytangential to the cylindrical surface of the press-roll, which isdirected downward or toward the felt, thereby to take off the web fromthe press-roll (in case it should have a tendency to adhere thereto orto wind thereon) and carry it to the felt. The pneumatic take-off devicehere shown by which such thin sheet of air is delivered may consist of ahollow shell or case, more or less triangular in longitudinal verticalsection, having converging upper and under sides and inclosed ends andhaving a narrow slot or passage at the apex of the triangle which isextended the shell or case, and said shell or case is supported bysuitable means adjacent the press-roll with its apex pointed in adirection substantially tangential to the cylina thin sheet of air whichissues, when desired, from the slot or passage, is directedsubstantially tangentially against said cylindrical surface and in'a'directi'on toward the felt, thereby to take off or blow off the webfrom the roll here across the width of so that it will pass to the felt.Said shell or case will be connected with any suitable air-forcingdevice bywhich the air will be delivered thereto under a suitablepressure, in order that it may be caused to forcibly issue therefrom.

Figure 1 shows, in conventional form, a portion of a paper-makingmachine having means for taking off the web from the pressroll andcarrying it to the felt. Fig. 2 is an enlarged plan view of the hollowshell or case with slotted end-portion by which a thin sheet of air isforcibly delivered substantially tangential to the cylindrical surfaceof the press-roll. Fig. 3 is a longitudinal vertical section of saidhollow shell or case.

leferring to the drawing of the machine here shown, 10 represents theusual felt passing over the usual rolls 12; and 13, lat represent onepair of press-rolls, it being understood that the machine has or mayhave several felts and several pairs of pressrolls, all as usual inFourdrinier or other forms of paper-making machines.

15 represents a hollow shell or case of approximately triangular form inlongitudinal. vertical section, it having converging upper and undersides and inclosed ends. The shape of the ends is here shown asparallel, but is not important. Said shell or case has at its apex along narrow slot or passage 16, extending as far as desired across itswidth, through which a thin sheet of air is caused to. issue, whendesired, at any desired pressure. This slot need not be continuous. Saidshell or case is connected at one side of its larger end-portion with apipe 20, which latter is is open communication with the shell or case,and is connected with a suitable air-forcing apparatus or compressed airsystem, by which air under pressure is delivered to the shell or case.Another pipe 21 is connected with the other side of the shell or case,opposite the pipe 20, which is likewise in open communication with theshell or case and has connected withit a pressure-gage. Said shell orcase is preferably so connected with said pipes 20 and 21, that it maybe swung thereon, as pivots, although in lieu thereof it may beotherwise pivotally or movably or even immovably supported. Said shellor case 15 arranged adjacent the upper press-roll and ashere shown itsconverging end-portion is arranged approximately tangential to thecylindrical surface thereof, so that the thin sheet of air which iscaused to issue forcipassage in its apex is bly from the slot or ornearly so, to the directed tangentially, cylindrical surface of saidroll, and in a downward direction, in order that the web may be takenoff of the roll and carried to the felt. The shell or case is preferablymade movable in order that it may be swung into and out of position foruse when" desired, although it may be permanently or stationarilysupported if desired. The dotted lines in Fig. 1 show the shell or caseswung downward. It is obvious that by swinging the shell or case thedirection of issuance of the thin sheetof air may be varied as desired,according to the extent of the swinging movement.

The pipe-system is provided preferably with a regulating-cock 25,whereby the supply and pressure of air may be regulated, and in case itis desiredsaid cock may be turned to entirely shut off the supply ofair. This provision also enables the device to be used temporarily orpermanently.

In operation I arrange the pneumatic take-ofl device in position so thatthe thin sheet of air will be directed approximately tangential againstthe cylindrical surface of the press-roll, so as to separate the webfrom the roll and then admit air to the device at a proper pressure.This pressure may be varied within very wide limits, but very slightpressure is suflicient. Less than four the upper press-roll if desired,but such.

contact is not necessary, andI prefer to maintain the device a fractionof an inch from the press-roll. It is not necessary to direct the airtangentially with exactness but only to direct the air so that it willforce itself between the roll and the web and peel the web from the rolland cause 1t to pass to or fall on the felt. pneumatic take-off deviceis in position, with the air issuing at the proper force and directed 1nthe proper manner, a narrow strip ofthe web is allowed to pass from theFourdrlnier wire onto the felt and between the press-rolls. Thisend-portion will, in substantlally all cases, follow the upper pressrolluntil it is met by the current of air from the take-01f device, whichwill immediately peel it from the press-roll and cause it to pass ordrop onto the felt and be carried along thereby. The width of the webcomlngfrom the Fourdrinier wire may then be gradually increased to itsfull extent and it Wlll follow along on the felt, being led along by thepart already thereon.

The foregoing is the simplest method of operating the device, but theorder in which the foregoing steps are given need not be followed, asthe thin sheet of air if given sufficient force, will cut the web anddrive it awayfrom the upper press-roll, even if the web is startedbefore the air blast, so that the web, before the air is turned on, haspassed beyond the pneumatic takeoff device. It will be necessary,however, to use more air pressure to cut the web after the end of theweb has passed the pneumatic take ofi' device than to peel off theendportlon of the web, and accordingly, I prefer to so arrange theoperation that the pneumatic take-off device operates against anend-portion ofthe web and not in such a manner that it is necessary forthe sheet of air to cut the web being wound around the press-roll. Afterthe full width of paper is running properly the air blast shouldordinarily be stopped, as unnecessary, but if any tendency to stick tothe roll appears the necessary blast may be continued permanently or aslong as desired.

In paper-making it is such a general custom to start a narrow strip ofweb from the l Tourdrinier wire onto the felts that my apparatus is madequite narrow, as compared lVhen the Y gas to use,

, to the cylindrical me -m though unnecessari y xp'ensive in construction and operation, would be entirely within the spirit of my invention,and in case of an exceedingly delicate web, or other peculiar condition,might be preferred; but for prac tical purposes a width of sayten inchesfor the pneumatic tak -oif device will be sufli- I cient.- I also preferto have the device ar rangedat one end of the press-roll, as being moreconvenient.

My invention may be appliedto any of the press-rolls in substantiallythesame mslilnner as herein shown for the firstpressro I have hereinreferred to the use of a sheet of air, that being the most convenientbut steam or any other suitable gas may-be used'if desired withoutdeparting from my invention and the term air is to be understood toinclude such suitable as. I

I claim 1. A 'Fourdrinier paper-making machine having in combination anupper press-r01 and felt, and pneumatic means arranged to remove the webadhering to the press-roll and carry it to the felt, substantially asdescribed.

2. A Eourdrinier paper-making machine having in combination anupper-press-roll and felt, and pneumatic means arranged to forciblydeliver a current of air against said press-roll in a direction towardthe felt, substantially as described. I. I

3. A Fourdrinier paper-making machine having in combination a rotatablepress-roll and a felt in moving engagement with said roll, and meansarranged to forcibly deliver a thin sheet of air substantiallytangential to the cylindrical surface of said roll, substantially asdescribed.

4. A Fourdrinier paper-making machine having in combination a rotatablepress-roll and a felt in moving engagement with said roll, and meansarrange to forcibly deliver a thin sheet of air substantially tangentialsurface of said roll and in a direction toward the felt, substantiallyas described.

5. A Fourdrinier paper-makin machine having in combination a air 0rotatable press-rolls and a moving elt arranged between them, and meansassociated with the upper press-roll of the pair and arran ed toforcibly deliver a thin sheet of air su stantially tangential to thecylindrical surface of said press-roll and in a direction toward thefelt, substantiallyas described. .7

' 6. A Fourdrinier paper-making machine having in combination arotatable press-roll and a felt in moving engagement withsaidpress-roll, and means to forcibly delivera thin sheet of airsubstantially tangential to the cylindrical surface of said roll, saidmeans being movable to vary the direction ranged to deliver. a

of issuance of said thin sheet of air, substantially as described.

7. A =Fourdrinier paper-making machine having in combination a rotatablepress-roll and a felt in moving engagement with said press-roll, andmeans arranged to forciblydeliver a thin sheet of air substantiallytangential to the cylindrical surface of said roll, said means beingpivotally supported, substantially as described.

8. A Fourdrinier paper-making machine having in combination a rotatablepress-roll, a felt in moving engagement with said roll, and a hollowshell in open communication with an air supply, said shell having a longnarrow slot arranged to deliver a thin sheet of air, and said shellbeing arrange jacent the press-roll, whereby said thin sheet of air isdelivered substantially tangential to the cylindrical surface of saidroll, substantially as described.

9. A Fourdrinier paper-making machine having in combination a rotatablepress-roll, a felt in moving engagement with said roll, and a hollowshell of triangular form in longitudinal vertical section, in opencommunication with an air supply, said shell having a long narrow slotat its apex, and said shell being arranged with its slot adjacent saidpress-roll whereby a thin sheet of air is delivered substantiallytangential to the cylindrical surface of said roll, substantially asdescribed.

10. A Fourdrinier paper-making machine having in combination a rotatablepress-roll," a felt in moving engagement with said roll, and a hollowshell movably supported and in open communication with an air supply,said shell having a long narrow slot arthin sheet of air, and said shellbeing arranged adjacent the pressroll, whereby said thin sheet of air isdelivered substantiall tangential to the cylindrical surface 0 saidroll, substantially as described.

11. A Fourdrinier paper-making machine having in combination a rotatablepress-roll, a feltin moving engagement with said roll, and hollowshellhaving openings at its ends and pipes arranged in said openingswhich are-connected with an air supply, said shell having a long narrowslot for the delivery of a thin sheet of air and said shell beinglocated adjacent the press-roll withits slot arranged to deliver a thinsheet of air substantially tangential to the cylindrical surface of saidroll and in a direction toward the felt, substantially as described.

12. A Fourdrinier paper-making machine having in combination rotatablepress-rolls,

a web-carrying felt passing between them, a

neumatic device arranged to direct a thin sheetof air between the upperpress-roll and a web in contact with sa1d roll, to prevent the web fromwinding on said roll and to d ad direct it toward the felt on which itis carried, said device being movable whereby the direction of issuanceof the current of air may be varied, and means for adjusting the forceof the current of air, substantially as described.

13. The pneumatic take-0E device for the upper press-roll of aFourdrinier papermaking machine, consisting of a hollow shell arrangedfor connection with a compressed air supply, and having an exit orificefor the delivering of a thin sheet of air, substantially as described.

14. That improvement in the art of making paper upon a Fourdrinier papermaking machine which consists in directing a thin sheet of airtangential to the cylindrical surface of the press-roll and toward thefelt, which is in moving engagement with said press-roll with forcesuflicient to take ofl the web fromsaid roll and carry it to the felt,and press-roll.

15. That improvement in the art of making paper upon a Fourdrinier papermaking machine which consists in directing a thin sheet of air withconsiderable velocity, tangential to the/cylindrical surface of thepress-roll, and vtoward the felt which is in moving engagement with saidpress-roll, therebyjto cause the web to maintain its engagement with thefelt and prevent it from winding on the press-roll.

In testimony whereof, I-have signed my.

name to this Specification, in the presence of two subscribingwitnesses.

' CHARLES E. POPE. Witnesses:

GUY CUNNINGHAM, MARY E. CARAHER.

prevent it from winding on the

